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analysis_server_client: remove unused JenkinsSmiHash class

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Towards https://github.com/dart-lang/sdk/issues/27698

Change-Id: I403a3e7fdc232debd0a527a8cc69692596516653
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/214221
Auto-Submit: Kevin Moore <kevmoo@google.com>
Commit-Queue: Kevin Moore <kevmoo@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
This commit is contained in:
Kevin Moore 2021-09-22 20:20:24 +00:00 committed by commit-bot@chromium.org
parent a0d9d35b80
commit 1809cb757f
1 changed files with 0 additions and 55 deletions
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55
pkg/analysis_server_client/lib/src/protocol/protocol_util.dart
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// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// Jenkins hash function, optimized for small integers.
///
/// Static methods borrowed from sdk/lib/math/jenkins_smi_hash.dart. Non-static
/// methods are an enhancement for the "front_end" package.
///
/// Where performance is critical, use [hash2], [hash3], or [hash4], or the
/// pattern `finish(combine(combine(...combine(0, a), b)..., z))`, where a..z
/// are hash codes to be combined.
///
/// For ease of use, you may also use this pattern:
/// `(new JenkinsSmiHash()..add(a)..add(b)....add(z)).hashCode`, where a..z are
/// the sub-objects whose hashes should be combined. This pattern performs the
/// same operations as the performance critical variant, but allocates an extra
/// object.
class JenkinsSmiHash {
int _hash = 0;
/// Finalizes the hash and return the resulting hashcode.
@override
int get hashCode => finish(_hash);
/// Accumulates the object [o] into the hash.
void add(Object o) {
_hash = combine(_hash, o.hashCode);
}
/// Accumulates the hash code [value] into the running hash [hash].
static int combine(int hash, int value) {
hash = 0x1fffffff & (hash + value);
hash = 0x1fffffff & (hash + ((0x0007ffff & hash) << 10));
return hash ^ (hash >> 6);
}
/// Finalizes a running hash produced by [combine].
static int finish(int hash) {
hash = 0x1fffffff & (hash + ((0x03ffffff & hash) << 3));
hash = hash ^ (hash >> 11);
return 0x1fffffff & (hash + ((0x00003fff & hash) << 15));
}
/// Combines together two hash codes.
static int hash2(int a, int b) => finish(combine(combine(0, a), b));
/// Combines together three hash codes.
static int hash3(int a, int b, int c) =>
finish(combine(combine(combine(0, a), b), c));
/// Combines together four hash codes.
static int hash4(int a, int b, int c, int d) =>
finish(combine(combine(combine(combine(0, a), b), c), d));
}